I would be surprised if Forsinard of all in that length had been identified for closure.
Nowadays, Forsinard has just two
raisons d'être: the Forsinard Flows RSPB reserve, a popular walking area complete with visitor centre (located at Forsinard station) and lookout tower, is one; the passing loop at the station is the other. What used to be the prevalent reason for the station to exist - a fairly swish hotel for people who want to shoot things - has now closed.
In the sixties, of course, none of these things would have been here; instead, the station served a few crumbs of houses as well as the road to Melvich (the present-day A897), which the railway swerved away from here (a branch was once proposed from Forsinard to Melvich and Portskerra via Dalhalvaig and Strath Halladale). It was somewhere below Kinbrace, Scotscalder and (somehow) Altnabreac in the pecking order (these stations were presumably deemed to serve more houses than Forsinard, and, to be fair, Altnabreac
did have the hotel at Lochdhu Lodge back then), but above Kildonan -
just. So it
is conceivable that Forsinard station could have been earmarked for closure back in the 1960s.
Incidentally, the Friends of the Far North Line (FoFNL) are campaigning for the reinstatement of the passing loop at Kinbrace. This would certainly be a worthwhile project along with the Lentran Loop, boosting journeys hugely by reducing the amount of services which skip stops or run direct to Wick with Thurso passengers bussed on from Georgemas (Forsinard has the only passing loop north of Helmsdale); interestingly enough, it would also probably make Kinbrace a mandatory stop again. Kinbrace is probably the closest thing to a settlement between Helmsdale and Halkirk, so it's really a quirk of history - Forsinard keeping its loop as opposed to Kinbrace, perhaps due to geography only - that Kinbrace is a request stop today and Forsinard isn't.
The stations between Inverness and Thurso/Wick are meant to have been closed owing to geographical location rather than due to other peculiar barometers like 'usage'. This explains why stations such as Beauly, Muir of Ord, Conon Bridge (then called Conon), Evanton, Alness and Watten were shut while Kildonan and Altnabreac stayed open; Beauly, Conon and Evanton were judged to be too close to Inverness and Dingwall, while the same was presumably considered true of Alness and neighbouring Invergordon (of course, Alness is nowadays the biggest town in Easter Ross), and Watten and Georgemas. Kildonan, meanwhile, stayed open because there were no stations near it - and so, bizarrely did Altnabreac. Now we have stations that are open where nothing exists - and stations shut where there's more than just peaty fields.
But that's just a theory. A FILM theory...